/* Request - Holds all information needed for a (partial) piece request.
   Copyright (C) 2003 Mark J. Wielaard

   This file is part of Snark.
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

package org.klomp.snark;

/**
 * Holds all information needed for a partial piece request.
 */
class Request {
	final int piece;
	final byte[] bs;
	final int off;
	final int len;

	/**
	 * Creates a new Request.
	 * 
	 * @param piece
	 *            Piece number requested.
	 * @param bs
	 *            byte array where response should be stored.
	 * @param off
	 *            the offset in the array.
	 * @param len
	 *            the number of bytes requested.
	 */
	Request(int piece, byte[] bs, int off, int len) {
		this.piece = piece;
		this.bs = bs;
		this.off = off;
		this.len = len;

		// Sanity check
		if(piece < 0 || off < 0 || len <= 0 || off + len > bs.length)
			throw new IndexOutOfBoundsException("Illegal Request " + toString());
	}

	public int hashCode() {
		return piece ^ off ^ len;
	}

	public boolean equals(Object o) {
		if(o instanceof Request) {
			Request req = (Request)o;
			return req.piece == piece && req.off == off && req.len == len;
		}

		return false;
	}

	public String toString() {
		return "(" + piece + "," + off + "," + len + ")";
	}
}
